The 8568A Spectrum Analyzer is a high performance analyzer for bench or HP-IB systems use that operates over the 100Hz to 1500MHz frequency range. A sophisticated phase lock system combines "synthesizer like" tuning and frequency accuracy with superior local oscillator spectral purity to make narrow resolution bandwidths practical at RF frequencies. Designed around its own internal bus and controlled by a microcomputer to yield significant improvements in RF measurement performance. Amplitude measurement range: -137 dBm to +30 dBm.